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SPH boundary & discontinuity correction terms |
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July 9, 2012, 06:47 |
SPH boundary & discontinuity correction terms
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#1 |
New Member
Tarek
Join Date: Jul 2012
Posts: 4
Rep Power: 13 |
I'm working on a CFD Matlab code using smoothing particle hydrodynamics (SPH) approach.
I have a great problem with the consistency at the boundaries & the discontinuities due to Shock waves. They make the code results totally wrong. I've tried to add terms for normalization & correction defined by (Liu) & (Chen) in the governing equations but I fail to get right answers. Could anyone help me how to use the normalization & correction techniques in Navier-Stokes equations especially in discontinuities |
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July 27, 2012, 06:15 |
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#2 |
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Daniel Barcarolo
Join Date: Jul 2012
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What are you using to model your boundary conditions??
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July 27, 2012, 06:26 |
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#3 |
New Member
Tarek
Join Date: Jul 2012
Posts: 4
Rep Power: 13 |
I used virtual exterior particles to mirror the fluid particles near the boundary. I didn't use boundary virtual particles.
Now I achieved the right results near the boundary. But in the wave discontinuity, I have an inaccuracy in result (represented in form of varying non-smooth results for a flow). |
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July 27, 2012, 06:36 |
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#4 |
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Daniel Barcarolo
Join Date: Jul 2012
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So you have used ghost particles...?
And are you also using Artificial Viscosity SPH? |
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July 27, 2012, 06:38 |
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#5 |
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Tarek
Join Date: Jul 2012
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Yes I used Monaghan Artificial Viscosity
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July 27, 2012, 06:46 |
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#6 |
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Daniel Barcarolo
Join Date: Jul 2012
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As far as I know with AV SPH you will always encounter some problem with your results. If you want more quality and precision you should look for preciser variants of SPH like Riemann-SPH and delta-SPH...
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July 27, 2012, 08:05 |
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#7 |
New Member
Tarek
Join Date: Jul 2012
Posts: 4
Rep Power: 13 |
OK I'll check & try that....many thanks
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